package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import static java.lang.System.in;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /*统计指定时间区间内的营业额
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期的后一天对应的日期
           begin = begin.plusDays(1);
           dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据，（状态为“已完成”的订单金额统计）
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //select sum(amount)from orders where order_time>beginTime and order_time<endTime and status=5;
            Map map = new HashMap<>();//因传递给sql的参数有三个，所以使用HashMap集合
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover=orderMapper.sumByMap(map);//关于金额使用Double
            turnover=turnover == null ? 0.0 : turnover;//若当天金额为空，则转为0.0
            turnoverList.add(turnover);

        }
        //封装并返回结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))//遍历dateList集合，将元素取出并以,为分隔符
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /*
    * 统计时间区间内用户数据
    * */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的新增用户数量slect count(id) from user where create_time<? and create_time>?
        List<Integer> newUserList = new ArrayList<>();
        //存放每天用户数量 select count(id) from user where create_time<?
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map= new HashMap();
            map.put("end",endTime);
            //只传递末尾时间，（就是查询当天前的总用户）
            Integer totalUser=userMapper.countByMap(map);

            map.put("begin",beginTime);
            //新增用户数量
            Integer newUser=userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        //封装并返回
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /*
     * 统计指定时间区间内的订单数据
     * */
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历dateList集合，查询每天的有效订单数和订单总数
        for (LocalDate date:dateList){
            //查询每天的订单总数select count(id) from orders where order_time>? and order_time<?
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount=getOrderCount(beginTime,endTime,null);

            //查询每天的有效订单数select count(id) from orders where order_time>? and order_time<? and status=5
            Integer validOrderCount=getOrderCount(beginTime,endTime,5);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内的有效订单数量
        Integer valiOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
       Double orderCompletionRate= 0.0;
       if (totalOrderCount!=0) {
          orderCompletionRate= Double.valueOf(valiOrderCount / totalOrderCount);
       }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(valiOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }
    /*
    * 根据条件统计订单数量
    * */
    private Integer getOrderCount(LocalDateTime begin,LocalDateTime end,Integer status){
        Map map = new HashMap<>();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }

    /*
     * 指定时间区间销量排名top10
     * */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        //
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        //封装返回结果数据
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /*
    导出运营数据报表
    * */
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业额数据---最近30天运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);//获取当前时间的前三十天
        LocalDate dateEnd = LocalDate.now().minusDays(1);//获取当前时间的前一天

        //查询概览数据(dateBegin,LocalTime.MIN为某天的最开始时间00:00:00)
        BusinessDataVO businessDataVO=workspaceService.getBusinessData(LocalDateTime.of(dateBegin,LocalTime.MIN),LocalDateTime.of(dateEnd,LocalTime.MAX));

        //2.通过POI将数据写入到Excel文件中
        InputStream in=this.getClass().getClassLoader().getResourceAsStream("template/dataTest.xlsx");

        try {
            //基于模版文件创建一个新的excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间:"+ dateBegin+ "至" + dateEnd);

            //获取第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获取第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i=0;i<30;i++){
                LocalDate date = dateBegin.plusDays(i);
                //查询某天的营业数据
                BusinessDataVO businessData=workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN),LocalDateTime.of(date,LocalTime.MAX));

                //获取某一行
                row= sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());

            }

            //3.通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
